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Why I got same radiation for CT (w+w/o contrast) and CT (w/o contrast)?

I recently got 2 CT's for abdomen and pelvis for kidney stones from the same hospital.

1) CTU (DLP; precon 100, contrast 280, total 380 mgy*cm)

2) CT without contrast ((DLP; 360 mgy*cm)

Why did I get similar DLP's for these? I thought I should get 1/3 of radiation for the CT without contrast as it is 1 pass? I am 25 and kind of worried about radiation so just wanted to ask the experts. Thank you all!

submitted by /u/samuelsss1213144
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source https://www.reddit.com/r/Radiology/comments/kh2ix5/why_i_got_same_radiation_for_ct_wwo_contrast_and/

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